Geochemical characteristics of the Permian coals in the Junger-Hebaopian mining district, northeastern Ordos Basin, China: Key role of paleopeat-forming environments in Ga-Li-REY enrichment

In order to study the trace element enrichment mechanism, this paper reports new petrology, geochemistry, and mineralogy data on the Permian coals of the Junger mining district and the Hebaopian mining district, northeastern Ordos Basin. In comparison with hard coals worldwide, the P2s1 coals are enriched in Be and the P1t3 coals are enriched in Zr in the Junger mining district, while the P2s1 coals in the Hebaopian mining district are enriched in Li, Zr, and Hf. The provenances of the enriched elements in the Permian coals from the Junger and Hebaopian mining districts are the Middle Proterozoic moyite in the Yinshan Oldland and the Benxi Formation bauxite.